211431434 has 4 divisors (see below), whose sum is σ = 317147154. Its totient is φ = 105715716.

The previous prime is 211431421. The next prime is 211431443. The reversal of 211431434 is 434134112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 170433025 + 40998409 = 13055^2 + 6403^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 52857857 + ... + 52857860.

Almost surely, 2^211431434 is an apocalyptic number.

211431434 is a deficient number, since it is larger than the sum of its proper divisors (105715720).

211431434 is a wasteful number, since it uses less digits than its factorization.

211431434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105715719.

The product of its digits is 1152, while the sum is 23.

The square root of 211431434 is about 14540.6820335224. The cubic root of 211431434 is about 595.7396671689.

Adding to 211431434 its reverse (434134112), we get a palindrome (645565546).

The spelling of 211431434 in words is "two hundred eleven million, four hundred thirty-one thousand, four hundred thirty-four".